Scalp Psoriasis/Dandruff

I think I may have scalp psoriasis. It happens more/flares up when I’m stressed out or upset, but I experience extreme dandruff daily and what seems to be scalp scabs? It gets all red and of course I can stop picking when I’m anxious, so I start to bleed and it leaves scabs all over. I’ve tried medicated dandruff shampoo which helped but only a little, & it feels like all my hair is coming out. I’m not talking just a few strands her and there, when I shower it’s as if I’m using hair removal and hand fulls just fall out as I clean my hair. WHAT DO I DO.